EP3542937A1 - Outil de coupe et procédé de coupe - Google Patents

Outil de coupe et procédé de coupe Download PDF

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Publication number
EP3542937A1
EP3542937A1 EP17871628.8A EP17871628A EP3542937A1 EP 3542937 A1 EP3542937 A1 EP 3542937A1 EP 17871628 A EP17871628 A EP 17871628A EP 3542937 A1 EP3542937 A1 EP 3542937A1
Authority
EP
European Patent Office
Prior art keywords
cutting
outer peripheral
edge
edge portion
cutting edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17871628.8A
Other languages
German (de)
English (en)
Other versions
EP3542937A4 (fr
Inventor
Minoru Yoshida
Takashi Kanda
Satoshi TERAZAWA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Hardmetal Corp
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Hardmetal Corp
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Hardmetal Corp, Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Hardmetal Corp
Publication of EP3542937A1 publication Critical patent/EP3542937A1/fr
Publication of EP3542937A4 publication Critical patent/EP3542937A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/12—Cutters specially designed for producing particular profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/12—Trimming or finishing edges, e.g. deburring welded corners

Definitions

  • the present invention relates to a cutting tool and a cutting method.
  • a burr called “exit burr” is likely to be formed at a backside surface opposite to the processed surface of the plate-like component. In such a case, it is often designed to remove the burr by providing a chamfered portion in the component shape. Generally, such a process is called "back chamfering".
  • a tool used for such back chamfering is in the form of a formed end mill, and has a cutting edge having an angle at a tip of the tool.
  • the cutting edge is referred to as "chamfering edge”.
  • Patent Literature 1 discloses a spherical-cutting-edge end mill that can be used also for back chamfering.
  • a cutting tool is a cutting tool constituted of a formed end mill, and includes a shank portion, a back chamfering edge portion, and an outer peripheral cutting edge portion.
  • the back chamfering edge portion has a back chamfering edge.
  • the outer peripheral cutting edge portion is located between the shank portion and the back chamfering edge portion and has a cutting edge at an outer peripheral surface of the outer peripheral cutting edge portion.
  • the cutting edge of the outer peripheral cutting edge portion is a right hand cut left hand helix edge.
  • the tool When the shape of the cutting edge is thus complicated and shape precision is required, the tool often has to have a straight cutting edge. However, with the straight cutting edge, cutting resistance becomes large during use to often result in chatter vibration.
  • One embodiment of the present disclosure has been made to solve the foregoing problem, and has an object to provide a cutting tool and a cutting method, by each of which occurrence of deformation of a workpiece, chatter vibration, and edge chipping can be suppressed.
  • a cutting tool and a cutting method can be provided, by each of which occurrence of deformation of a workpiece, chatter vibration, and edge chipping can be suppressed.
  • workpiece 20 is processed by cutting tool 10 rotating clockwise. Accordingly, during cutting, cutting resistance toward the shank portion 10C side is generated in back chamfering edge portion 10A but cutting force by the right hand cut left hand helix edge is exerted toward the tip side in outer peripheral cutting edge portion 10B. Hence, the cutting resistance exerted on back chamfering edge portion 10A and the cutting force exerted on outer peripheral cutting edge portion 10B are exerted in opposite directions and are therefore canceled by each other as internal force. Accordingly, an effect of reducing cutting force on workpiece 20 can be obtained, thereby suppressing problems such as deformation of workpiece 20, chatter vibration, and edge chipping.
  • cutting tool 10 is, for example, a cutting tool constituted of a formed end mill, and has a shank portion 10C, back chamfering edge portions 10A, and an outer peripheral cutting edge portion 10B.
  • Shank portion 10C is a portion to be attached to a main shaft of a milling machine.
  • This shank portion 10C is, for example, a straight shank but may be a taper shank.
  • Each of back chamfering edge portions 10A is disposed at the tip side of cutting tool 10.
  • Back chamfering edge portion 10A protrudes to the outer peripheral side relative to outer peripheral cutting edge portion 10B. Accordingly, as shown in Fig. 2 , a maximum diameter D1 of the tip of cutting tool 10 is larger than a maximum diameter D2 of shank portion 10C.
  • the plurality of (for example, four) back chamfering edge portions 10A are disposed.
  • Each of the plurality of back chamfering edge portions 10A has a back chamfering edge 1a.
  • This back chamfering edge 1a is constituted of a ridgeline at which flank face 1b and rake face 1c cross each other in back chamfering edge portion 10A.
  • Each of the plurality of back chamfering edges 1a is more distant away from center of rotation C of outer peripheral cutting edge portion 10B as each of the plurality of back chamfering edges 1a is more distant away from shank portion 10C.
  • Each of the plurality of back chamfering edges 1a is a left hand helix edge, for example.
  • each of the plurality of back chamfering edges 1a is not limited to the left hand helix edge, may be a straight edge or may be a right hand helix edge.
  • cutting can be performed when each of the plurality of back chamfering edges 1a is a straight edge or a right hand helix edge, resistance by back chamfering edge 1a in the direction toward the tip is not provided to cause large chattering, with the result that a burr is likely to be generated at the upper side of a workpiece. Therefore, each of the plurality of back chamfering edges 1a is preferably a left hand helix edge.
  • Outer peripheral cutting edge portion 10B is located between shank portion 10C and back chamfering edge portion 10A.
  • Outer peripheral cutting edge portion 10B has a plurality of (for example, four) cutting edges 2a at the outer peripheral surface.
  • Each of the plurality of cutting edges 2a is constituted of a ridgeline at which flank face 2b and rake face 2c cross each other in outer peripheral cutting edge portion 10B.
  • Each of the plurality of cutting edges 2a is a right hand cut left hand helix edge.
  • the term "right hand cut” indicates that cutting tool 10 is rotated clockwise in a viewpoint in which back chamfering edge portion 10A is seen from shank portion 10C.
  • the term “left hand helix edge” indicates that cutting edge 2a is twisted in the counter clockwise direction in the viewpoint in which back chamfering edge portion 10A is seen from shank portion 10C.
  • the term “left hand helix edge” indicates that cutting edge 2a extends up to the left in a direction in which center of rotation (axial center) C of cutting tool 10 extends in the front view shown in Fig. 2 .
  • back chamfering edge 1a is a 'straight edge'
  • back chamfering edge 1a is parallel to center of rotation C of cutting tool 10 in the front view shown in Fig. 2 .
  • Each of the plurality of cutting edges 2a extends straightly and is inclined at a negative angle, for example.
  • a helix angle ⁇ ( Fig. 2 ) in each of the plurality of cutting edges 2a is more than or equal to 3° and less than or equal to 30°.
  • helix angle ⁇ refers to an inclination angle measured based on center of rotation C of cutting tool 10 as a reference, i.e., an inclination angle relative to center of rotation C. Specifically, assuming that center of rotation C is 0° in the front view shown in Fig. 2 , a clockwise angle ⁇ is regarded as a "positive angle” and a counter clockwise angle ⁇ is regarded as a "negative angle”.
  • Cutting tool 10 has a plurality of (for example, four) swarf discharging flutes 3 in the outer peripheral surface.
  • Each of the plurality of swarf discharging flutes 3 extends from outer peripheral cutting edge portion 10B to the tip of cutting tool 10 via back chamfering edge portion 10A.
  • Each of the plurality of swarf discharging flutes 3 is a left hand helix.
  • a portion of a wall surface of swarf discharging flute 3 in back chamfering edge portion 10A constitutes rake face 1c of back chamfering edge portion 10A.
  • a portion of a wall surface of swarf discharging flute 3 in outer peripheral cutting edge portion 10B constitutes rake face 2c of outer peripheral cutting edge portion 10B.
  • Back chamfering edge 1a of back chamfering edge portion 10A and cutting edge 2a of outer peripheral cutting edge portion 10B are continuous to each other.
  • Flank face 1b of back chamfering edge portion 10A and flank face 2b of outer peripheral cutting edge portion 10B are continuous to each other.
  • Rake face 1c of back chamfering edge portion 10A and rake face 2c of outer peripheral cutting edge portion 10B are continuous to each other.
  • Cutting tool 10 further has an end cutting edge 10D. End cutting edge 10D is located at a tip opposite to shank portion 10C.
  • cutting tool 10 is rotated in the clockwise direction (direction of an arrow R in Fig. 2 ) in a viewpoint in which back chamfering edge portion 10A is seen from the shank portion 10C side in cutting tool 10.
  • a workpiece 20 is cut by cutting tool 10 in such a rotation state.
  • a wall surface of a hole 20a of workpiece 20 is cut by cutting edge 2a of outer peripheral cutting edge portion 10B of cutting tool 10.
  • an open end 20c of hole 20a at the backside surface 20b side of workpiece 20 is cut by back chamfering edge 1a of back chamfering edge portion 10A.
  • back chamfering edge 1a With this cutting by back chamfering edge 1a, an exit burr at open end 20c of hole 20a is removed and open end 20c is chamfered.
  • a cutting tool 110 in the first comparative example is different from cutting tool 10 of the present embodiment in that each of back chamfering edge 1a of back chamfering edge portion 10A and cutting edge 2a of outer peripheral cutting edge portion 10B is a straight edge.
  • a cutting tool 120 in the second comparative example is different from cutting tool 10 of the present embodiment in that each of back chamfering edge 1a of back chamfering edge portion 10A and cutting edge 2a of outer peripheral cutting edge portion 10B is a right hand helix edge.
  • cutting edge 2a is a straight edge in the configuration of the first comparative example shown in Fig. 3 , cutting resistance becomes large during cutting, with the result that chatter vibration is likely to occur.
  • cutting resistance force in back chamfering edge 1a is generated to be exerted in a direction toward shank portion 10C along center of rotation C of cutting tool 120 as indicated by an arrow A1.
  • cutting edge 2a is a right hand helix edge, cutting force by cutting edge 2a is generated to be exerted in the direction toward shank portion 10C along center of rotation C of cutting tool 120 as indicated by an arrow A3.
  • cutting edge 2a is a left hand helix edge.
  • cutting force by cutting edge 2a is generated in the direction toward the tip along center of rotation C of cutting tool 120 as indicated by an arrow A2.
  • cutting resistance toward the shank portion 10C side is generated in back chamfering edge portion 10A during cutting as indicated by an arrow A1.
  • the direction of the cutting resistance is opposite to the direction of the cutting force exerted on outer peripheral cutting edge portion 10B. Accordingly, the cutting resistance and the cutting force are canceled by each other as internal force. Accordingly, an effect of reducing cutting force on workpiece 20 can be obtained, thereby suppressing the problems such as deformation of workpiece 20, chatter vibration, and edge chipping.
  • cutting resistance is reduced by the helical edge effect as compared with the straight edge.
  • cutting is performed using the opposite forces from both sides. This leads to reduced force of deforming the plate-like thin component serving as workpiece 20.
  • cutting edge 2a is a left hand helix edge, a burr can be also suppressed from being generated at the entrance side of hole 20a.
  • the above-mentioned effect obtained by the cutting tool of the present embodiment also serves to suppress detachment of a layered structure when cutting a composite material having a layered form, such as CFRP (Carbon Fiber Reinforced Plastics).
  • CFRP Carbon Fiber Reinforced Plastics
  • cutting edge 2a of outer peripheral cutting edge portion 10B extends straightly and is inclined at a negative angle. Accordingly, cutting force can be exerted toward the tip side in outer peripheral cutting edge portion 10B.
  • a helix angle at cutting edge 2a of outer peripheral cutting edge portion 10B is more than or equal to 3° and less than or equal to 30°. Accordingly, cutting force can be appropriately exerted toward the tip side in outer peripheral cutting edge portion 10B. When the helix angle is less than 3°, cutting force toward the tip side becomes insufficient. On the other hand, when the helix angle is more than 30°, a contact length of the cutting edge becomes large, thus resulting in too large resistance.
  • back chamfering edge portion 10A protrudes to the outer peripheral side relative to outer peripheral cutting edge portion 10B, and back chamfering edge 1a is more distant away from center of rotation C of outer peripheral cutting edge portion 10B as back chamfering edge 1a is more distant away from shank portion 10C. Accordingly, the backside surface of workpiece 20 can be chamfered.
  • cutting tool 10 further includes end cutting edge 10D located at the tip opposite to shank portion 10C, a perforating process can be performed.
  • 1a back chamfering edge
  • 2a cutting edge
  • 1b, 2b flank face
  • 1c, 2c rake face
  • 3 swarf discharging flute
  • 10, 110, 120 cutting tool
  • 10A cutting edge portion
  • 10B outer peripheral cutting edge portion
  • 10C shank portion
  • 10D end cutting edge
  • 20 workpiece
  • 20a hole
  • 20b backside surface
  • 20c open end
  • A1, A2, A3 arrow
  • C center of rotation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
EP17871628.8A 2016-11-15 2017-07-07 Outil de coupe et procédé de coupe Withdrawn EP3542937A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016222374 2016-11-15
PCT/JP2017/024926 WO2018092351A1 (fr) 2016-11-15 2017-07-07 Outil de coupe et procédé de coupe

Publications (2)

Publication Number Publication Date
EP3542937A1 true EP3542937A1 (fr) 2019-09-25
EP3542937A4 EP3542937A4 (fr) 2020-07-01

Family

ID=62145398

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17871628.8A Withdrawn EP3542937A4 (fr) 2016-11-15 2017-07-07 Outil de coupe et procédé de coupe

Country Status (7)

Country Link
US (1) US20200070260A1 (fr)
EP (1) EP3542937A4 (fr)
JP (1) JP6918013B2 (fr)
KR (1) KR20190084955A (fr)
CN (1) CN109937108A (fr)
RU (1) RU2019114463A (fr)
WO (1) WO2018092351A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102118378B1 (ko) * 2018-03-07 2020-06-03 주식회사 엘지화학 절삭 장치 및 이를 이용한 필름 적층체의 면취 방법
CN109590525B (zh) * 2018-12-06 2020-10-23 东莞捷荣技术股份有限公司 一种手机中框专用复合立铣刀及手机中框铣削方法
JP6714248B1 (ja) * 2019-11-06 2020-06-24 株式会社ジーベックテクノロジー 面取りカッターおよびワークの面取り方法
DE102021128197A1 (de) 2021-10-28 2023-05-04 Andreas Vratny Spiralisierter Entgrater

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1898732A (en) * 1929-07-20 1933-02-21 Krohne Gustav Milling cutter
DE628595C (de) * 1933-04-30 1936-04-07 Otto Weyel Formfraeser fuer teils parallelwandige und teils pilzfoermige Nuten
JPH0294021U (fr) * 1989-01-11 1990-07-26
JPH11156622A (ja) 1997-11-25 1999-06-15 Hitachi Tool Eng Ltd 球状刃エンドミル
JP2001071210A (ja) * 1999-06-30 2001-03-21 Geiyoo:Kk クリスマスカッタ
JP2005131728A (ja) * 2003-10-29 2005-05-26 Osg Corp 総形回転切削工具
JP2014012300A (ja) * 2012-07-03 2014-01-23 Esaki Sangyo:Kk 切削ビット
JP6247807B2 (ja) * 2014-12-12 2017-12-13 株式会社 東陽 切削工具及びこの切削工具を備えた切削装置
KR101667010B1 (ko) * 2015-01-12 2016-10-17 (주)케이씨티 복수 면의 가공이 가능한 복합가공 엔드밀
JP2016222374A (ja) 2015-05-28 2016-12-28 京セラドキュメントソリューションズ株式会社 給紙カセット、およびこれを備えた画像形成装置

Also Published As

Publication number Publication date
CN109937108A (zh) 2019-06-25
US20200070260A1 (en) 2020-03-05
JPWO2018092351A1 (ja) 2019-10-10
WO2018092351A1 (fr) 2018-05-24
JP6918013B2 (ja) 2021-08-11
EP3542937A4 (fr) 2020-07-01
RU2019114463A (ru) 2020-12-17
KR20190084955A (ko) 2019-07-17

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